https://llvm.org/bugs/show_bug.cgi?id=26732
Bug ID: 26732
Summary: lld needs to provide _DYNAMIC symbol when creating a
shared library
Product: lld
Version: unspecified
Hardware: PC
OS: FreeBSD
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedb...@nondot.org
Reporter: ema...@freebsd.org
CC: llvm-bugs@lists.llvm.org
Blocks: 23214
Classification: Unclassified
Created attachment 15943
--> https://llvm.org/bugs/attachment.cgi?id=15943&action=edit
sample test case for _DYNAMIC symbol
The linker-provided _DYNAMIC symbol is required by FreeBSD's rtld to find its
own DYNAMIC segment.
Example showing how it is used, from FreeBSD's rtld.c, rtld_machdep.h:
---
/* Return the address of the .dynamic section in the dynamic linker. */
#define rtld_dynamic(obj) \
((const Elf_Dyn *)((obj)->relocbase + (Elf_Addr)&_DYNAMIC))
#define RTLD_IS_DYNAMIC() (&_DYNAMIC != NULL)
extern Elf_Dyn _DYNAMIC;
#pragma weak _DYNAMIC
...
if (RTLD_IS_DYNAMIC()) {
objtmp.dynamic = rtld_dynamic(&objtmp);
---
Attached is a test case sample that passes with ld.bfd.
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